<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>bootstrap</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
</head>
<body>


    <div class="panel panel-default">
        <div class="panel-heading" id="headingOne">
            <h4 class="panel-title">
                <a id="oA">
                    点击11111
                </a>
            </h4>
        </div>
        <div id="one" class="collapse">
            <div class="panel-body">
                展示出来内容11111
            </div>
        </div>
    </div>
    
    
<script src="js/jquery-3.6.0.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<script>
$(function(){
    $("#oA").click(function(){
        // $("#one").collapse("toggle");
        $("#one").collapse("show");
    })
})
</script>

</body>
</html>